<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>iframe测试体验页面无刷新</title>

    <script>
        function go() {
            //所有的值变量，提前获取
            var url=document.getElementById("url").value;
            document.getElementById("iframe1").src=url;
        }
    </script>
</head>
<body>
<div>
    <p>请输入地址：</p>
    <p>
    <input type="text" id="url">
    <input type="button" value="提交" onclick="go()">
    </p>
</div>

<div>
    <iframe  id="iframe1" style="width: 100%;height: 500px"></iframe>
</div>
</body>
</html>